Method and Apparatus for Establishing Guaranteed Bit Rate (GBR) Quality of Service (QoS) Flow in Session

ABSTRACT

This application provides a method and an apparatus for establishing a guaranteed bit rate GBR quality of service QoS flow in a session. The method includes: receiving, by a session management function SMF, first information from an access and mobility management function AMF; obtaining, by the SMF, PDU session management subscription information from a unified data management module UDM; and when dynamic PCC is not deployed, establishing, by the SMF based on the first information and at least one of the PDU session management subscription information and local PDU session policy information of the SMF, a default GBR QoS flow in the PDU session.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/CN2019/087729, filed on May 21, 2019, which claims priority to Chinese Patent Application No. 201810489265.0, filed on May 21, 2018, The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties.

TECHNICAL FIELD

This application relates to the field of communications technologies, and more specifically, to a method and an apparatus for establishing a GBR QoS flow in a session.

BACKGROUND

To transmit service data between user equipment (UE) and a data network (DN), a packet data unit (PDU) session usually needs to be established between the UE and a network device, and one or more quality of service (QoS) flows are established in the PDU session to schedule services with different QoS requirements in the same session.

Specifically, in a conventional solution, a default non-guaranteed bit rate (GBR) QoS flow is established in a PDU session of UE, and then one or more non-default GBR QoS flows or non-GBR QoS flows are established based on a service requirement of the UE. In other words, in addition to the default GBR QoS flow, other QoS flows exist in the PDU session. Therefore, in a process of transmitting service data, classification is performed on the UE and an access network device according to a specified rule, and QFI marking is performed. Such a processing procedure causes many processing delays, and how to reduce these delays is a problem to be resolved.

SUMMARY

This application provides a method and an apparatus for establishing a GBR QoS flow in a session, to reduce a delay of transmitting service data by using the GBR QoS flow.

According to a first aspect, a method for establishing a GBR QoS flow in a session is provided. The method includes: receiving, by a session management function SMF, first information from an access and mobility management function AMF, where the first information includes establishment request information of a packet data unit PDU session from a terminal device; obtaining, by the SMF, PDU session management subscription information from a unified data management module UDM; and establishing, by the SMF based on the first information, a default GBR QoS flow in the PDU session.

Optionally, when dynamic policy and charging control PCC is deployed, the SMF obtains PDU session policy information from a policy control function PCF; and the establishing, by the SMF based on the first information, a default GBR QoS flow in the PDU session includes: establishing, by the SMF based on the first information and at least one of the PDU session management subscription information and the PDU session policy information, the default GBR QoS flow in the PDU session of the SMF.

Alternatively, when dynamic PCC is not deployed, the SMF establishes, based on the first information and at least one of the PDU session management subscription information and local PDU session policy information of the SMF, the default GBR QoS flow in the PDU session.

In this application, the local PDU session policy information is stored in the SMF, while the PDU session policy information is obtained from the PCF.

It should be understood that after receiving the first information, the SMF may first establish the PDU session for the terminal device, and then establish the default GBR QoS flow in the PDU session. In addition, the default GBR QoS flow may be a GBR QoS flow that is established at an initial stage of PDU session establishment according to a default QoS rule and that always exists in a life cycle of the PDU session.

Before sending the first information to the SMF, the AMF may receive an establishment request message of the PDU session sent by the terminal device, generate the first information based on the establishment request message of the PDU session, and then send the first information to the SMF. When there are a plurality of available SMFs around the AMF, the AMF may further select one SMF, and then send the first information to the selected SMF.

In this application, after receiving the first information sent by the AMF, the SMF can directly establish the default GBR QoS flow based on related information, so that time required for establishing a GBR QoS flow can be reduced when the GBR QoS flow is needed for transmitting data.

Optionally, the terminal device is a device that supports a low-latency and high-reliability connection URLLC service.

Further, the terminal device may be a device that includes only a URLLC service.

In some implementations, the first information includes second information, and the second information is at least one of a subscription permanent identifier SUPI, a data network name DNN, single network slice selection assistance information S-NASSI, service indication information, a default guaranteed bit rate GBR quality of service QoS flow indication, QoS index information, and QoS parameter information.

Optionally, the second information may be any combination of the SUPI, the DNN, the S-NASSI, the service indication information, the default GBR QoS flow indication, the QoS index information, and the QoS parameter information.

The second information may indicate that the default GBR QoS flow is to be established in the PDU session.

The second indication information can be used to determine that the default GBR QoS flow needs to be established in the PDU session.

In some implementations, when the dynamic PCC is deployed, the method further includes: obtaining, by the SMF, the PDU session management subscription information from the UDM.

Optionally, the obtaining, by the SMF, the PDU session management subscription information from the UDM includes: sending, by the SMF, a subscription information request message to the UDM, where the subscription information request message carries the second information; and receiving, by the SMF, the PDU session management subscription information sent by the UDM, where the PDU session management subscription information includes subscription information of the default GBR QoS flow, and the subscription information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

The second information may be used to indicate the UDM to send, to the SMF, the PDU session management subscription information that includes the subscription information of the default GBR QoS flow.

In some implementations, that the SMF obtains PDU session policy information from a PCF includes: sending, by the SMF, a policy information request message to the PCF, where the policy information request message carries the second information; and receiving, by the SMF, the PDU session policy information sent by the PCF, where the PDU session policy information includes a default quality of service rule, and the default quality of service rule includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR of the default GBR QoS flow.

The second information may indicate the PCF to send, to the SMF, the PDU session policy information that includes the policy information of the default GBR QoS flow.

In some implementations, the SMF rejects a request for establishing a non-GBR QoS flow in the PDU session.

After the default GBR QoS flow is established, a non-GBR QoS flow is no longer established, but another GBR QoS flow can be established in the PDU session.

In this application, the request for establishing a non-GBR QoS flow is rejected, so that only a GBR QoS flow can be established in the PDU, and a requirement of some specific services (for example, a URLLC service) for transmitting data can be met.

In some implementations, the default GBR QoS flow includes a time-sensitive GBR QoS flow.

The time-sensitive GBR QoS flow may be used to transmit time-sensitive service data. For example, the time-sensitive GBR QoS flow may be used to transmit service data of the URLLC service.

According to a second aspect, a method for establishing a GBR QoS flow in a session is provided. The method includes: receiving, by a unified data management module UDM, a subscription information request message from a session management function SMF, where the subscription information request message is used to request to obtain packet data unit PDU session management subscription information from the UDM, and the session subscription information includes subscription information of a default GBR QoS flow; and sending, by the UDM, the subscription information of the default GBR QoS flow to the SMF, where the subscription information of the default GBR QoS flow is used to establish the default GBR QoS flow.

In some implementations, the subscription information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

After receiving the subscription information request message, the UDM can send the subscription information of the default GBR QoS flow to the SMF, so that the SMF can directly establish the default GBR QoS flow in the PDU session by referring to the subscription information of the default GBR QoS flow, thereby reducing time required for establishing the GBR QoS flow.

According to a third aspect, a method for establishing a GBR QoS flow in a session is provided. The method includes: receiving, by a unified data management module UDM, a subscription information request message from a session management function SMF, where the subscription information request message includes second information, and the second information is at least one of a subscription permanent identifier SUPI, a data network name DNN, single network slice selection assistance information S-NASSI, service indication information, a default guaranteed bit rate GBR quality of service QoS flow indication, QoS index information, and QoS parameter information; and sending, by the UDM based on the second information, subscription information of a default GBR QoS flow to the SMF, where the subscription information of the default GBR QoS flow is used to establish the default GBR QoS flow.

In some implementations, the subscription information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

After receiving the second information, the UDM determines to send the subscription information of the default GBR QoS flow to the SMF, so that the SMF can directly establish the default GBR QoS flow in the PDU session by referring to the subscription information of the default GBR QoS flow after receiving the subscription information of the default GBR QoS flow, thereby reducing time required for establishing the GBR QoS flow.

According to a fourth aspect, a method for establishing a GBR QoS flow in a session is provided. The method includes: receiving, by a policy control module PCF, a policy information request message from a session management function SMF, where the policy information request message is used to request to obtain PDU session policy information from the PCF, and the PDU session policy information includes policy information of a default GBR QoS flow; and sending, by the PCF, the policy information of the default GBR QoS flow to the SMF, where the policy information of the default GBR QoS flow is used to establish the default GBR QoS flow.

In some implementations, the subscription information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

After receiving the policy information request message, the PCF can send the policy information of the default GBR QoS flow to the SMF, so that the SMF can directly establish the default GBR QoS flow in the PDU session by referring to the policy information of the default GBR QoS flow, thereby reducing time required for establishing the GBR QoS flow.

According to a fifth aspect, a method for establishing a GBR QoS flow in a session is provided. The method includes: receiving, by a policy control function entity PCF, a policy information request message from a session management function SMF, where the policy information request message includes second information, and the second information is at least one of a subscription permanent identifier SUPI, a data network name DNN, single network slice selection assistance information S-NASSI, service indication information, QoS index information, QoS parameter information, and session subscription information; determining, by the PCF, whether policy information of a GBR QoS flow corresponding to the second information is policy information of a default GBR QoS flow; and if the policy information of the GBR QoS flow corresponding to the second information is the policy information of the default GBR QoS flow, sending, by the PCF, the policy information of the default GBR QoS flow to the SMF.

In some implementations, the subscription information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

After receiving the second information, the PCF determines to send the policy information of the default GBR QoS flow to the SMF, so that the SMF can directly establish the default GBR QoS flow in the PDU session by referring to the policy information of the default GBR QoS flow after receiving the policy information of the default GBR QoS flow, thereby reducing time required for establishing the GBR QoS flow.

According to a sixth aspect, a method for establishing a GBR QoS flow in a session is provided. The method includes: generating, by a terminal device, an establishment request message of a packet data unit PDU session, where the establishment request message of the PDU session includes first indication information, and the first indication information is used to indicate that a default guaranteed bit rate GBR quality of service QoS flow is to be established in the PDU session; and sending, by the terminal device, the establishment request message of the PDU session to a session management function SMF, to establish a PDU session that includes the default GBR QoS flow.

By sending, to the AMF, the establishment request message of the PDU session including the first indication information, the terminal device can request the SMF to directly establish the default GBR QoS flow in the PDU session, thereby reducing time required for establishing the GBR QoS flow.

In some implementations, the first indication information includes at least one of service indication information, QoS index information, and QoS parameter information.

In some implementations, the method further includes: rejecting, by the terminal device, a message for establishing a non-GBR QoS flow in the PDU session from the SW′.

In this application, a request for establishing a non-GBR QoS flow is rejected, so that only a GBR QoS flow can be established in the PDU, and a requirement of some specific services (for example, a URLLC service) for transmitting data can be met.

In some implementations, the default GBR QoS flow includes a time-sensitive GBR QoS flow.

According to a seventh aspect, an apparatus for establishing a guaranteed bit rate GBR quality of service QoS flow in a session is provided. The apparatus includes a module configured to perform the method in any one of the first aspect to the fifth aspect.

Specifically, the apparatus may be a network side device or a network device.

According to an eighth aspect, a terminal device is provided. The terminal device includes a module configured to perform the method according to the sixth aspect.

According to a ninth aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores an instruction. When the instruction is run on a computer, the computer is enabled to perform the method according to any one of the first to the sixth aspects.

According to a tenth aspect, a computer program product including an instruction is provided. When the computer program product is run on a computer, the computer is enabled to perform the method according to any one of the first aspect to the sixth aspect.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of an architecture of a 5G system in a non-roaming scenario;

FIG. 2 is a schematic flowchart of a method for establishing a GBR QoS flow in a session according to an embodiment of this application;

FIG. 3 is a schematic diagram of a GBR QoS flow in a PDU session;

FIG. 4 is a schematic flowchart of a method for establishing a GBR QoS flow in a session according to an embodiment of this application;

FIG. 5 is a schematic flowchart of a method for establishing a GBR QoS flow in a session according to an embodiment of this application;

FIG. 6 is a schematic flowchart of a method for establishing a GBR QoS flow in a session according to an embodiment of this application;

FIG. 7 is a schematic flowchart of a method for establishing a GBR QoS flow in a session according to an embodiment of this application;

FIG. 8 is a schematic flowchart for transmitting uplink data by using a default GBR QoS flow in a PDU session;

FIG. 9 is a schematic flowchart for transmitting downlink data by using a default GBR QoS flow in a PDU session;

FIG. 10 is a schematic block diagram of an apparatus for establishing a GBR QoS flow in a session according to an embodiment of this application;

FIG. 11 is a schematic block diagram of an apparatus for establishing a GBR QoS flow in a session according to an embodiment of this application;

FIG. 12 is a schematic block diagram of an apparatus for establishing a GBR QoS flow in a session according to an embodiment of this application; and

FIG. 13 is a schematic block diagram of an apparatus for establishing a GBR QoS flow in a session according to an embodiment of this application.

DESCRIPTION OF EMBODIMENTS

The following describes technical solutions of this application with reference to accompanying drawings.

The technical solutions in embodiments of this application may be applied to a 4th generation (4G) system, a future 5th generation (5G) system, a new radio (NR) system, and a system that has an architecture similar to that of the 5G system.

The terminal device in the embodiments of this application may also be referred to as user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile console, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, a user apparatus, or the like. The terminal device may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device having a wireless communication function, a computing device, another processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network, or a terminal device in a future evolved public land mobile network (PLMN). This is not limited in the embodiments of this application.

Specifically, the terminal device in the embodiments of this application may be a device with a low-latency and high-reliability connection (URLLC) service.

The technical solutions in the embodiments of this application may be specifically applied to a 5G system in a non-roaming scenario. Referring to FIG. 1, the 5G system in the non-roaming scenario is described as follows.

FIG. 1 is a schematic diagram of an architecture of a 5G system in a non-roaming scenario.

The system architecture shown in FIG. 1 includes user equipment (UE), a radio access network (RAN), an access and mobility management network element (AMF), a session management network element (SMF), a user plane network element (UPF), a policy control network element (PCF), a unified data management network element (UDM), an authentication server module (AUSF), and a data network module (DN).

Main functions of devices in a core network in the system architecture shown in FIG. 1 are as follows:

The AMF is responsible for access and mobility management, including functions such as user authentication, handover, and location update; the SMF is responsible for session management, including establishment, modification, and release of a protocol data unit (PDU) session; the PCF is responsible for user policy management, including a mobility-related policy and a PDU session-related policy, such as a QoS policy and a charging policy; the UPF is responsible for forwarding user data; the UDM stores subscription data of a user; the AUSF has an authentication and authorization service function and is responsible for authenticating and authorizing UE access; and the DN is a destination that a user's PDU session accesses.

It should be understood that, in addition to the 5G system in the non-roaming scenario shown in FIG. 1, the technical solutions in the embodiments of this application may be applied to another system architecture. For example, the technical solutions in the embodiments of this application may also be applied to the 5G system in a roaming scenario.

In a conventional solution, when a URLLC service exists, to transmit data of the URLLC service, a GBR QoS flow needs to be created in a PDU session. In this case, two signaling exchange processes are required. One is a PDU session establishment process, and the other is a session modification process. This causes a delay and unnecessary establishment of a default non-GBR QoS flow. Therefore, to reduce the delay of establishing a GBR QoS flow, in this application, a default GBR QoS flow is directly established in a PDU session, so as to meet a requirement for transmitting the data of the URLLC service.

Referring to FIG. 2, a method for establishing a GBR QoS flow in a session according to an embodiment of this application is described in detail as follows.

FIG. 2 is a schematic flowchart of a method for establishing a GBR QoS flow in a session according to an embodiment of this application. The method shown in FIG. 2 may be performed by a session management function (SMF). The method shown in FIG. 2 includes step 101 to step 103. Step 101 to step 103 are described in detail separately below.

Step 101. An SMF receives first information from an AMF.

The first information may be generated by the AMF based on an establishment request message of a PDU session after the AMF receives the establishment request message of the PDU session of a terminal device, and the first information includes the establishment request message of the PDU session of the terminal device. The first information may be used to request the SMF to establish a PDU session for the terminal device.

As shown in FIG. 2, before step 101, the method shown in FIG. 2 may further include step 104. Step 104 is specifically that the AMF receives the establishment request message of the PDU session sent by the terminal device.

After receiving the establishment request message of the PDU session, the AMF may generate the first information based on the establishment request message of the PDU session, and then send the first information to the SMF.

In addition, when sending the establishment request message of the PDU session to the AMF, the terminal device may specifically first send the establishment request message of the PDU session to a RAN, and then the RAN forwards the establishment request message of the PDU session to the AMF. When forwarding the establishment request message of the PDU session to the AMF, the RAN may further forward some other information of the terminal device, for example, location information of the terminal device, to the AMF.

Alternatively, the first information includes second information, and the second information is at least one of a subscription permanent identifier (SUPI), a data network name (DNN), single network slice selection assistance information (S-NASSI), service indication information, a default guaranteed bit rate GBR quality of service QoS flow indication, QoS index information (QoS index), and QoS parameter information.

The SPUI, the DNN, and the S-NASSI may be information added by the AMF based on the PDU session request message after the AMF receives the PDU session request message, and the service indication information, the QoS index information (QoS index) and the QoS parameter information may be carried in PDU session request information sent by the terminal device.

The service indication information may be specifically URLLC service indication information (URLLC indication). When a service indicated by the service indication information is a URLLC service, the service indication information may be used to indicate the SMF to establish a default GBR QoS flow in the PDU session.

Compared with the foregoing manner in which the service indication information indirectly indicates, by using a specific service type (for example, a URLLC service), to establish the default GBR QoS flow in the PDU session, the default guaranteed bit rate GBR quality of service QoS flow indication may directly indicate the SMF to establish the default GBR QoS flow in the PDU session.

The service indication information and the default GBR QoS flow indication may be included in a UE route selection policy (URSP). For example, if the service indication information is URLLC service indication information or the default GBR QoS flow indication, parameters included in the URSP are those shown in Table 1.

TABLE 1 Allows a PCF Information to modify item Description Type a URSP Scope Route selection Determines an applying Manda- Yes UE descriptor sequence of route tory context priority selection descriptors. Route selection Defines a route selection Manda- component component. tory SSC mode A single value for an Op- Yes UE selection SSC mode. tional context Network slice A single value or a list Op- Yes UE selection of S-NSSAI values. tional context DNN selection A single value or a list Op- Yes UE of DNN values. tional context Non-seamless Indicates whether traffic Op- Yes UE offload of a matching tional context indication application is to be offloaded to non-3GPP access outside of a PDU session. Access type Indicates a preferred Op- Yes UE preference access type (3GPP or tional context non-3GPP) when UE establishes a PDU session for a matching application. URLLC Indicates whether a Op- Yes UE parameter/ matching application is a tional context Default URLLC service or GBR QoS whether a matching flow application is to be indication connected to a GBR session.

As shown in Table 1, the URLLC parameter/default GBR QoS flow indication included in the URSP may indicate the service indication information, and a value of the URLLC parameter/default GBR QoS flow indication may be used to indicate whether to establish the default GBR QoS flow in the PDU session.

For example, when the URLLC parameter/default GBR QoS flow indication corresponds to one bit, if a value of the bit is 0, it indicates that the default GBR QoS flow does not need to be established in the PDU session; or if a value of the bit is 1, it indicates that the default GBR QoS flow needs to be established in the PDU session (that is, the SMF is indicated to establish the default GBR QoS flow in the PDU).

It should be understood that there may be a correspondence between the QoS index information and a resource type, information about the correspondence between the QoS index information and the resource type may be stored in the SMF, and the correspondence between the QoS index information and the resource type may be specifically that shown in Table 2.

TABLE 2 Default Packet Packet maximum Default QoS 5QI Resource Default delay error data burst averaging Example index value type priority budget rate volume window service X 10 Delay- 11  5 ms 10⁻⁵ 160B TBD Remote critical control Y 11 GBR 12 10 ms 10⁻⁵ 320B TBD Intelligent Transportation System Z 12 13 20 ms 10⁻⁵ 640B TBD M 16 18 10 ms 10⁻⁴ 255B TBD Discrete automation N 12 19 10 ms 10⁻⁴ 1358B  TBD Discrete automation

It should be understood that when the first information includes the QoS index information, the SMF may parse the first information to obtain the QoS index information. Next, the SMF may determine, based on the QoS index information, whether to establish the default GBR QoS flow in the PDU session. As shown in Table 2, when an index value indicated by the QoS index information is any one of X, Y, Z, M, and N, a resource type corresponding to the QoS index information is the delay-critical GBR, the SMF determines to establish the default GBR QoS flow in the PDU session.

Step 102. The SMF obtains PDU session management subscription information from a UDM.

Optionally, that the SMF obtains PDU session management subscription information from a UDM includes: sending, by the SMF, a subscription information request message to the UDM, where the subscription information request message carries the second information; and receiving, by the SMF, the PDU session management subscription information sent by the UDM, where the PDU session management subscription information includes subscription information of the default GBR QoS flow, and the subscription information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

It should be understood that, because the first information received by the SMF includes the session establishment request message, the SMF is triggered to request to obtain the PDU session management subscription information from the UDM for session establishment.

Step 103. The SMF establishes the default GBR QoS flow in the PDU session.

It should be understood that in the 5G system, the default GBR QoS flow may be a GBR QoS flow that is established at an initial stage of PDU session establishment according to default QoS and that always exists in a life cycle of the PDU session.

Based on whether dynamic PCC is deployed, the SMF establishes the default GBR QoS flow in the PDU session in either of the following cases:

Case 1: The dynamic PCC is deployed.

In case 1, because the dynamic PCC is deployed, the SMF may obtain PDU session policy information from the UDM, and may refer to the PDU session policy information when establishing the default GBR QoS flow in the PDU session.

Therefore, when the dynamic PCC is deployed, the method shown in FIG. 2 further includes step 105.

Step 105 is specifically that the SMF obtains the PDU session policy information from the PCF.

Optionally, that the SMF obtains the PDU session policy information from the UDM includes: sending, by the SMF, a policy information request message to the PCF, where the policy information request message carries the second information; and receiving, by the SMF, the PDU session policy information sent by the PCF, where the PDU session policy information includes a default quality of service rule, and the default quality of service rule includes the 5G quality of service identifier (5QI), the allocation and retention priority (ARP), the guaranteed flow bit rate (GFBR), and the maximum flow bit rate (MFBR) of the default GBR QoS flow.

After obtaining the PDU session policy information, the SMF establishes the default GBR QoS flow in the PDU session.

That the SMF establishes the default GBR QoS flow in the PDU session includes: establishing, by the SMF based on the first information and at least one of the PDU session management subscription information and the PDU session policy information, the default GBR QoS flow in the PDU session.

It should be understood that the PDU session is a session established by the SMF for the terminal device.

Specifically, in case 1, that the SMF establishes the default GBR QoS flow in the PDU session specifically includes the following three implementations: (1) Establishing, based on the first information and the PDU session management subscription information, the default GBR QoS flow in the PDU session (2) Establishing, based on the first information and the PDU session policy information, the default GBR QoS flow in the PDU session (3) Establishing, based on the first information, the session management policy information, and PDU session policy information, the default GBR QoS flow in the PDU session

Case 2: The dynamic PCC is not deployed.

In case 2, because the dynamic PCC is not deployed, the SMF cannot obtain the PDU session policy information from the UDM. In other words, the SMF cannot refer to the PDU session policy information when establishing the default GBR QoS flow in the PDU session. Because the SMF stores local PDU session policy information, the SMF can refer to the local PDU session policy information when establishing the default GBR QoS flow in the PDU session.

Therefore, when the dynamic PCC is not deployed, that the SMF establishes the default GBR QoS flow in the PDU session includes: establishing, by the SMF based on the first information and at least one of the PDU session management subscription information and the local PDU session policy information, the default GBR QoS flow in the PDU session.

Specifically, in case 1, that the SMF establishes the default GBR QoS flow in the PDU session specifically includes the following three implementations: (4) Establishing, by the SMF based on the first information and the PDU session management subscription information, the default GBR QoS flow in the PDU session (5) Establishing, by the SMF based on the first information and the local PDU session policy information, the default GBR QoS flow in the PDU session (6) Establishing, by the SMF based on the first information, the session management policy information, and the local session policy information, the default GBR QoS flow in the PDU session

A mechanism in which the SMF establishes the default GBR QoS flow in the PDU session based on the first information and other information after receiving the first information is described below.

The first information includes the session establishment request message. Therefore, after the SMF receives the first information, the first information triggers the SMF to request to obtain the PDU session management subscription information from the UDM for session establishment. Similarly, the first information may further trigger the SMF to request to obtain the PDU session policy information from the PCF for session establishment.

The PDU session management subscription information obtained by the SMF from the UDM may be provided to the PCF when the SMF requests to obtain the PDU session policy information from the PCF.

When the PDU session management subscription information provided by the UDM is inconsistent with the PDU session policy information provided by the PCF, the PDU session policy information may overwrite the PDU session management subscription information, in other words, the PDU session policy information is used.

When the SMF provides the PDU session management subscription information obtained from the UDM to the PCF when the SMF requests to obtain the PDU session policy information from the PCF, the PCF may determine whether the PDU session policy information is inconsistent with the PDU session management subscription information. If the PDU session policy information is inconsistent with the PDU session management subscription information, the PDU session policy information is used. When the SMF does not provide the PDU session management subscription information obtained from the UDM to the PCF when the SMF requests to obtain the PDU session policy information from the PCF, the SMF determines whether the PDU session policy information is inconsistent with the PDU session management subscription information. If the PDU session policy information is inconsistent with the PDU session management subscription information, the PDU session policy information is used.

For example, if the PDU session management subscription information obtained by the SMF from the UDM includes a default non-GBR QoS parameter, and the PDU session policy information obtained from the PCF includes a default GBR QoS parameter, then the SMF establishes, based on the first information and the default GBR QoS parameter that is included in the PDU session policy information obtained from the PCF, the default GBR QoS flow in the PDU session.

Alternatively, if the PDU session management subscription information obtained by the SMF from the UDM includes default GBR QoS parameters A1, B1, C1, and D1, and the PDU session policy information obtained from the PCF includes default GBR QoS parameters A2, B2, C2, and D2, then the SMF establishes, based on the first information and the default GBR QoS parameters A2, B2, C2, and D2 that are included in the PDU session policy information obtained from the PCF, the default GBR QoS flow in the PDU session. The GBR QoS parameters are A2, B2, C2, and D2. The GBR QoS parameters A1, B1, C1, and D1 can be the same as or different from A2, B2, C2, and D2. If they are different, the session policy information provided by the PCF is used.

Optionally, in an embodiment, the method shown in FIG. 2 further includes: The SMF rejects a request for establishing a non-GBR QoS flow in the PDU session.

That the SMF rejects a request for establishing a non-GBR QoS flow in the PDU session may be specifically as follows: After receiving the request for establishing the non-GBR QoS flow, the SMF replies that the non-GBR QoS flow cannot be established in the PDU session or does not reply to the request.

The request for establishing the non-GBR QoS flow may be from the terminal device, the UDM, or the PCF.

Optionally, in an embodiment, the method shown in FIG. 2 further includes: The SMF accepts a request for establishing a GBR QoS flow in the PDU session.

In other words, in this application, after the default GBR QoS flow is established, a non-GBR QoS flow is no longer established, but another GBR QoS flow can be established in the PDU session.

In this application, the request for establishing a non-GBR QoS flow is rejected, so that only a GBR QoS flow can be established in the PDU, and a requirement of some specific services (for example, a URLLC service) for transmitting data can be met.

As shown in FIG. 3, a PDU session is established between UE and a UPF, there is a radio bearer between the UE and an NB, and there is a core network tunnel between the NB and the UPF. The PDU session includes a plurality of GBR QoS flows, and the plurality of GBR QoS flows include one default GBR QoS flow and a plurality of other GBR QoS flows.

Optionally, in an embodiment, the default GBR QoS flow includes a time-sensitive GBR QoS flow.

The time-sensitive GBR QoS flow may be used to transmit time-sensitive service data. For example, the time-sensitive GBR QoS flow may be used to transmit service data of the URLLC service.

The foregoing describes in detail the method for establishing the GBR QoS flow in the session in this embodiment of this application from a perspective of an SMF referring to FIG. 2 and FIG. 3. Referring to FIG. 4, a method for establishing a GBR QoS flow in a session in an embodiment of this application is described as follows from a perspective of a terminal device. The method shown in FIG. 4 may be performed by a terminal device, and the method shown in FIG. 4 includes step 201 and step 202. Step 201 and step 202 are described in detail separately as follows.

Step 201. A terminal device generates an establishment request message of a PDU session.

The establishment request message of the PDU session includes first indication information, and the first indication information is used to request to establish a PDU session that includes a default GBR QoS flow; and

Step 202. The terminal device sends the establishment request message of the PDU session to an SMF.

When sending the establishment request message of the PDU session to the SMF, the terminal device may first send the establishment request message of the PDU session to an AMF, and then the AMF sends the establishment request message of the PDU session to the SMF.

Optionally, the default GBR QoS flow includes a time-sensitive GBR QoS flow.

In this application, by sending, to the AMF, the establishment request message of the PDU session including the first indication information, the terminal device can request the SMF to directly establish the default GBR QoS flow in the PDU session, thereby reducing time required for establishing the GBR QoS flow.

Optionally, the first indication information includes at least one of service indication information, QoS index information, and QoS parameter information.

The service indication information may be specifically used to indicate a URLLC service. For specific content, refer to Table 1.

Optionally, the terminal device rejects a message for establishing a non-GBR QoS flow in the PDU session from the SMF.

It should be understood that in this application, the terminal device requests to establish only a GBR QoS flow in the PDU session, and does not establish a non-GBR QoS flow in the PDU session. In addition to the default GBR QoS flow, the GBR QoS flow established in the PDU session may further include another GBR QoS flow. In other words, in this application, a plurality of GBR QoS flows may be established in the PDU session. One GBR QoS flow is the default GBR QoS flow, and the other GBR QoS flows are non-default GBR QoS flows.

In this application, a request for establishing a non-GBR QoS flow is rejected, so that only a GBR QoS flow can be established in the PDU, and a requirement of some specific services (for example, a URLLC service) for transmitting data can be met.

The foregoing describes in detail the method for establishing the GBR QoS flow in the session in this embodiment of this application from the perspective of the terminal device referring to FIG. 4. Referring to FIG. 5, a method for establishing a GBR QoS flow in a session in an embodiment of this application is described as follows from a perspective of a UDM. The method shown in FIG. 5 may be performed by a UDM, and the method shown in FIG. 5 includes step 301 and step 302. Step 301 and step 302 are described in detail separately as follows.

Step 301. A UDM receives subscription information request message from an SMF.

Step 302. The UDM sends subscription information of a default GBR QoS flow to the SMF.

In this application, after receiving the subscription information request message, the UDM can send the subscription information of the default GBR QoS flow to the SMF, so that the SMF can directly establish the default GBR QoS flow in a PDU session by referring to the subscription information of the default GBR QoS flow, thereby reducing time required for establishing the GBR QoS flow.

Optionally, the subscription information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

Specifically, based on the subscription information of the default GBR QoS flow included in PDU session management subscription information that is stored in the UDM, there may be two cases in which the UDM sends the subscription information of the default GBR QoS flow to the SMF.

Case 1: The PDU session management subscription information stored in the UDM includes only the subscription information of the default GBR QoS flow.

In case 1, because the PDU session management subscription information stored in the UDM includes only the subscription information of the default GBR QoS flow, after receiving the subscription information request message from the SMF, the UDM may directly send the subscription information of the default GBR QoS flow to the SMF.

Case 2: The PDU session management subscription information stored in the UDM includes the subscription information of the default GBR QoS flow and subscription information of another GBR QoS flow.

In case 2, because the UDM stores subscription information of a plurality of GBR QoS flows, the subscription information request message sent by the SMF may further include second information, where the second information is at least one of an SUPI, a DNN, S-NASSI, service indication information, QoS index information, and QoS parameter information.

Next, the UDM determines whether subscription data of a GBR QoS flow corresponding to the second information is subscription data of the default GBR QoS flow. When the subscription data of the GBR QoS flow corresponding to the second information is the subscription data of the default GBR QoS flow, the UDM sends the subscription information of the default GBR QoS flow to the SMF.

The foregoing describes in detail the method for establishing the GBR QoS flow in the session in this embodiment of this application from the perspective of the UDM referring to FIG. 5. Referring to FIG. 6, a method for establishing a GBR QoS flow in a session in an embodiment of this application is described as follows from a perspective of a PCF. The method shown in FIG. 6 may be performed by a PCF, and the method shown in FIG. 6 includes step 401 and step 402. Step 401 and step 402 are described in detail separately as follows.

Step 401. A PCF receives policy information request message from an SMF.

Step 402. The PCF sends policy information of a default GBR QoS flow to the SMF.

In this application, after receiving the policy information request message, the PCF can send the policy information of the default GBR QoS flow to the SMF, so that the SMF can directly establish the default GBR QoS flow in a PDU session by referring to the policy information of the default GBR QoS flow, thereby reducing time required for establishing the GBR QoS flow.

Optionally, the subscription information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

Specifically, based on the policy information of the default GBR QoS flow included in session management policy information that is stored in the PCF, there may be two cases in which the PCF sends the policy information of the default GBR QoS flow to the SMF.

Case 1: The session management policy information stored in the PCF includes only the policy information of the default GBR QoS flow.

In case 1, because the session management policy information stored in the PCF includes only the policy information of the default GBR QoS flow, after receiving the policy information request message from the SMF, the PCF may directly send the policy information of the default GBR QoS flow to the SMF.

Case 2: The session management policy information stored in the PCF includes the policy information of the default GBR QoS flow and policy information of another GBR QoS flow.

In case 2, because the PCF stores the policy information of a plurality of GBR QoS flows, the policy information request message sent by the SMF may further include second information, where the second information is at least one of an SUFI, a DNN, S-NASSI, service indication information, QoS index information, and QoS parameter information.

Next, the PCF determines whether policy information of a GBR QoS flow corresponding to the second information is the policy information of the default GBR QoS flow. When the policy information of the GBR QoS flow corresponding to the second information is the policy information of the default GBR QoS flow, the PCF sends the policy information of the default GBR QoS flow to the SMF.

Referring to FIG. 7, a process of establishing a GBR QoS flow in a session according to an embodiment of this application is described as follows.

FIG. 7 is a schematic flowchart for establishing a GBR QoS flow in a session according to an embodiment of this application. FIG. 7 shows an entire procedure for establishing a default GBR QoS flow, and the procedure includes step 501 to step 505. Step 501 to step 505 are described in detail as follows.

Step 501. UE sends a session establishment request message to an AMF.

Specifically, the session establishment request message may be an establishment request message of a PDU session, and the establishment request message may be used to request to establish the PDU session between the UE and a UPF.

In addition, the UE may send the establishment request message of the PDU session to the AMF over a RAN. Specifically, the UE may first send the session establishment request message to the RAN, and then the RAN forwards the establishment request message of the PDU session to the AMF. When forwarding the establishment request message of the PDU session to the AMF, the RAN may further forward other information, for example, location information of the UE, to the AMF.

The session establishment request message may include first information, where the first information is used to indicate that a default guaranteed bit rate GBR quality of service QoS flow is to be established in the PDU session, and the first information may specifically include at least one of a subscription permanent identifier SUPI, a data network name (DNN), single network slice selection assistance information (S-NASSI), service indication information, QoS index information, and QoS parameter information.

Step 502. The AMF selects an SMF for the UE.

The AMF may select the SMF by itself, or the AMF may send an SMF discovery request to a network function repository function (NRF) and the NRF selects the SMF. When the SMF is selected, reference may be made to information such as the DNN, a network slice, subscription information, local PDU session policy information, and a load.

Step 503. The AMF sends a session context creation request to the SMF.

The context creation request is specifically a PDU session context creation request, and the context creation request may include the session establishment request message sent by the UE to the AMF. Further, the context creation request may include the first information in the session establishment request message.

Step 504. The SMF obtains subscription data.

Specifically, the SMF may obtain PDU session subscription information from a UDM and obtain PDU session policy information from a PCF.

That the SMF obtains the PDU session subscription information from the UDM specifically includes: sending, by the SMF, a subscription information request message to the UDM; and receiving, by the SMF, the PDU session subscription information sent by the UDM.

That the SMF obtains the PDU session policy information from the PCF specifically includes: sending, by the SMF, a PDU session policy information request message to the PCF; and receiving, by the SMF, the PDU session policy information sent by the PCF.

It should be understood that both the subscription information request message and the PDU session policy information request message may carry the first information, the PDU session subscription information may carry subscription information of the default GBR QoS flow, and the PDU session policy information may carry policy information of the default GBR QoS flow.

Step 505. The SMF establishes, based on a PDU session request message of the UE, and at least one of the PDU session subscription information and the PDU session policy information, the PDU session that includes the default GBR QoS flow.

To establish, by the SMF, the PDU session and the default GBR QoS flow in the PDU session, reference can be made to a process in which a PDU session is established and a GBR QoS flow is established in the PDU session in an existing solution.

After the default GBR QoS flow is established in the PDU session, service data may be transmitted by using the default GBR QoS flow. Referring to FIG. 8 and FIG. 9, a process of transmitting uplink data and downlink data by using the default GBR QoS flow is described as follows.

FIG. 8 is a flowchart for transmitting uplink data by using a default GBR QoS flow. A specific process shown in FIG. 8 includes the following steps:

Step 601. An SMF sends a signaling message to UE when a PDU session is established or modified.

Step 602. The SMF sends a signaling message to a UPF when the PDU session is established or modified.

Step 603. After receiving uplink data, the UE determines, based on a URSP, one PDU session for the uplink data.

Step 604. After determining the PDU session, the UE sends the uplink data to a RAN by using a unique radio resource of the PDU session.

Step 605. The RAN sends the uplink data to the UPF through an N3 tunnel.

Step 606. After decapsulating the uplink data, the UPF sends obtained data to a DN.

It should be understood that in step 601 and step 602, when the PDU session includes only a default GBR QoS flow and does not include another GBR QoS flow or a non-GBR QoS flow, the signaling message sent by the SMF to the UE does not carry QoS rule information, and the signaling message sent by the SMF to the UPF does not carry forwarding rule information.

In addition, in step 603, when the UE has a plurality of PDU sessions, the UE needs to determine, based on the URSP, the PDU session corresponding to the uplink data.

In step 605, after receiving the uplink data, the RAN determines, based on an ID of the session determined in step 604, the N3 tunnel corresponding to the session, and then sends the uplink data to the UPF through the N3 tunnel.

In a process of transmitting the uplink data, the signaling messages sent by the SMF to the UE and the UPF do not include the QoS rule information and a forwarding rule message. In addition, the UE directly sends the uplink data to the RAN by using the unique radio resource of the PDU session, so that signaling exchange in transmitting the uplink data can be simplified, and a delay of transmitting downlink data can be further reduced.

FIG. 9 is a flowchart for transmitting downlink data by using a default GBR QoS flow. A specific process shown in FIG. 9 includes the following steps.

Step 701. An SMF sends a signaling message to UE when a PDU session is established or modified.

Step 702. The SMF sends a signaling message to a UPF when the PDU session is established or modified.

Step 703. The UPF receives downlink data sent by a DN.

Step 704. The UPF determines a session based on a UE IP address and sends the downlink data to a RAN through an N3 tunnel corresponding to the session.

Step 705. The UPF sends the downlink data to the RAN through the N3 tunnel.

Step 706. After receiving the downlink data, the RAN sends the downlink data to the UE by using a corresponding radio resource based on a correspondence between an N3 tunnel and a radio resource.

It should be understood that when the PDU session includes only a default GBR QoS flow and does not include another GBR QoS flow or a non-GBR QoS flow, in step 701 and step 702, the signaling message sent by the SMF to the UE does not carry QoS rule information, the signaling message sent by the SMF to the UPF does not carry forwarding rule information; and in step 703, when sending the downlink data to the RAN, the UPF is not required to perform QFI marking on a data packet of the downlink data.

In a process of transmitting the downlink data, the signaling messages sent by the SMF to the UE and the UPF do not include the QoS rule information and a forwarding rule message. In addition, when sending the downlink data to the RAN, the UPF is not required to perform QFI marking on the data packet of the downlink data, so that signaling exchange in the process of transmitting the downlink data can be simplified, and a delay of transmitting downlink data can be further reduced.

The foregoing describes in detail the method for establishing the GBR QoS flow in the session in the embodiments of this application referring to FIG. 1 to FIG. 9. Referring to FIG. 10 to FIG. 13, an apparatus for establishing a GBR QoS flow in a session in the embodiments of this application is described as follows. It should be understood that the apparatus for establishing the GBR QoS flow shown in FIG. 10 to FIG. 13 can perform the steps of the method for establishing the GBR QoS flow in the session in the embodiments of this application shown in FIG. 1 to FIG. 9. For brevity, repeated descriptions are properly omitted in the following descriptions of the apparatus for establishing the GBR QoS flow in the session in the embodiments of this application.

FIG. 10 is a schematic block diagram of an apparatus for establishing a GBR QoS flow in a session according to an embodiment of this application. An apparatus 1000 shown in FIG. 10 can perform the method for establishing the GBR QoS flow in the session according to the embodiments of this application. The apparatus 1000 specifically includes: a transceiver module 1001, configured to receive first information from an access and mobility management function AMF, where the first information includes establishment request information of a packet data unit PDU session from a terminal device; and the transceiver module is 1001 further configured to obtain PDU session management subscription information from a unified data management module UDM; and a processing module 1002, configured to: when dynamic policy and charging control PCC is deployed, establish, based on the first information and at least one of the PDU session management subscription information and PDU session policy information, a default GBR QoS flow in a PDU session established by the SMF, where the PDU session policy information is obtained from a policy control function PCF; or when dynamic PCC is not deployed, establish, based on the first information and at least one of the PDU session management subscription information and local PDU session policy information of the SMF, a default GBR QoS flow in the PDU session.

In this application, after receiving the first information sent by the AMF, the SMF can directly establish the default GBR QoS flow based on related information, so that time required for establishing a GBR QoS flow can be reduced when the GBR QoS flow is needed for transmitting data.

Optionally, in an embodiment, the first information includes second information, and the second information is at least one of a subscription permanent identifier SUPI, a data network name DNN, single network slice selection assistance information S-NASSI, service indication information, a default guaranteed bit rate GBR quality of service QoS flow indication, QoS index information, and QoS parameter information.

Optionally, in an embodiment, the transceiver module 1001 is configured to: send a subscription information request message to the UDM, where the subscription information request message carries the second information; and receive the PDU session management subscription information sent by the UDM, where the PDU session management subscription information includes subscription information of the default GBR QoS flow, and the subscription information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

Optionally, in an embodiment, the transceiver module 1001 is configured to: send a policy information request message to the PCF, where the policy information request message carries the second information; and receiving, the PDU session policy information sent by the PCF, where the PDU session policy information includes a default quality of service rule, and the default quality of service rule includes the 5G quality of service identifier 5QI, the allocation and retention priority ARP, the guaranteed flow bit rate GFBR, and the maximum flow bit rate MFBR of the default GBR QoS flow.

Optionally, in an embodiment, the processing module 1002 is further configured to reject a request for establishing a non-GBR QoS flow in the PDU session.

Optionally, in an embodiment, the default GBR QoS flow includes a time-sensitive GBR QoS flow.

FIG. 11 is a schematic block diagram of an apparatus for establishing a GBR QoS flow in a session according to an embodiment of this application. An apparatus 2000 shown in FIG. 11 can perform the method for establishing the GBR QoS flow in the session according to the embodiments of this application. The apparatus 2000 specifically includes: a processing module 2001, configured to generate an establishment request message of a packet data unit PDU session, where the establishment request message of the PDU session includes first indication information, and the first indication information is used to indicate that a default guaranteed bit rate GBR quality of service QoS flow is to be established in the PDU session; and a sending module 2002, configured to send the establishment request message of the PDU session to a session management function SMF, to establish a PDU session that includes the default GBR QoS flow.

Optionally, in an embodiment, the first indication information includes at least one of service indication information, a default guaranteed bit rate GBR quality of service QoS flow indication, QoS index information, and QoS parameter information.

Optionally, in an embodiment, the processing module 2001 is further configured to reject a message for establishing a non-GBR QoS flow in the PDU session from the SMF.

In this application, by sending, to the AMF, the establishment request message of the PDU session including the first indication information, the apparatus 2000 can request the SMF to directly establish the default GBR QoS flow in the PDU session, thereby reducing time required for establishing the GBR QoS flow.

Optionally, in an embodiment, the default GBR QoS flow includes a time-sensitive GBR QoS flow.

FIG. 12 is a schematic block diagram of an apparatus for establishing a GBR QoS flow in a session according to an embodiment of this application. An apparatus 3000 shown in FIG. 12 can perform the method for establishing the GBR QoS flow in the session according to the embodiments of this application. The apparatus 3000 specifically includes: a receiving module 3001, configured to receive a subscription information request message from a session management function SMF, where the subscription information request message is used to request to obtain PDU session management subscription information from the UDM, the session subscription information includes subscription information of a default GBR QoS flow; and a sending module 3002, configured to send the subscription information of the default GBR QoS flow to the SMF, where the subscription information of the default GBR QoS flow is used to establish the default GBR QoS flow.

Optionally, the policy information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

In this application, after the subscription information request message is received, the subscription information of the default GBR QoS flow can be sent to the SMF, so that the SMF can directly establish the default GBR QoS flow in the PDU session by referring to the subscription information of the default GBR QoS flow, thereby reducing time required for establishing the GBR QoS flow.

This application further provides another apparatus for establishing a GBR QoS flow. The apparatus includes a receiving module 4001 and a sending module 4002 (a specific structure of the apparatus is the same as that in FIG. 12, which also includes a receiving module and a sending module). Specific functions of the receiving module 4001 and the sending module 4002 are as follows:

The receiving module 4001 is configured to receive a subscription information request message from a session management function SMF, where the subscription information request message includes second information, and the second information is at least one of a subscription permanent identifier SUPI, a data network name DNN, single network slice selection assistance information S-NASSI, service indication information, a default guaranteed bit rate GBR quality of service QoS flow indication, QoS index information, and QoS parameter information.

The sending module 4002 is configured to send, based on the second information, subscription information of a default GBR QoS flow to the SMF, where the subscription information of the default GBR QoS flow is used to establish the default GBR QoS flow.

Optionally, the policy information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

In this application, after the second information is received, the subscription information of the default GBR QoS flow is determined to be sent to the SMF, so that the SMF can directly establish the default GBR QoS flow in the PDU session by referring to the subscription information of the default GBR QoS flow after receiving the subscription information of the default GBR QoS flow, thereby reducing time required for establishing the GBR QoS flow.

This application further provides another apparatus for establishing a GBR QoS flow. The apparatus includes a receiving module 5001 and a sending module 5002 (a specific structure of the apparatus is the same as that in FIG. 12, which also includes a receiving module and a sending module). Specific functions of the receiving module 5001 and the sending module 5002 are as follows:

The receiving module 5001 is configured to receive a policy information request message from a session management function SMF, where the policy information request message is used to request to obtain PDU session policy information from the PCF, the PDU session policy information includes policy information of a default GBR QoS flow.

The sending module 5002 is configured to send the policy information of the default GBR QoS flow to the SMF, where the policy information of the default GBR QoS flow is used to establish the default GBR QoS flow.

Optionally, the policy information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

In this application, after the policy information request message is received, the policy information of the default GBR QoS flow can be sent to the SMF, so that the SMF can directly establish the default GBR QoS flow in the PDU session by referring to the policy information of the default GBR QoS flow, thereby reducing time required for establishing the GBR QoS flow.

This application further provides another apparatus for establishing a GBR QoS flow. The apparatus includes a receiving module 6001 and a sending module 6002 (a specific structure of the apparatus is the same as that in FIG. 12, which also includes a receiving module and a sending module). Specific functions of the receiving module 6001 and the sending module 6002 are as follows:

The receiving module 6001 is configured to receive a policy information request message from a session management function SMF, where the policy information request message includes second information, and the second information is at least one of a subscription permanent identifier SUPI, a data network name DNN, single network slice selection assistance information S-NASSI, service indication information, a default guaranteed bit rate GBR quality of service QoS flow indication, QoS index information, QoS parameter information, or session subscription information.

The sending module 6002 is configured to send, based on the second information, policy information of a default GBR QoS flow to the SMF.

Optionally, the policy information of the default GBR QoS flow includes a 5G quality of service identifier 5QI, an allocation and retention priority ARP, a guaranteed flow bit rate GFBR, and a maximum flow bit rate MFBR.

In this application, after the second information is received, the policy information of the default GBR QoS flow is determined to be sent to the SMF, so that the SMF can directly establish the default GBR QoS flow in the PDU session by referring to the policy information of the default GBR QoS flow after receiving the policy information of the default GBR QoS flow, thereby reducing time required for establishing the GBR QoS flow.

FIG. 13 is a schematic block diagram of an apparatus for establishing a GBR QoS flow in a session according to an embodiment of this application. An apparatus 4000 shown in FIG. 13 can perform the method for establishing the GBR QoS flow in the session according to the embodiments of this application. The apparatus 4000 specifically includes: a transceiver 4001; a memory 4002, configured to store a program; a processor 4003, configured to execute the program stored in the memory 4002, wherein when the program stored in the memory 4002 is executed, the processor 4003 and the transceiver 4001 are configured to perform the steps of the method for establishing the default GBR QoS flow in the session in the embodiments of this application.

The transceiver 4001 and the processor 4003 may include a large quantity of transistors, logic gate circuits, or circuit devices. The transceiver 4001 and the processor 4003 may be located on different chips or a same chip. The memory is usually located on an independent chip, or may be located on the same chip as the transceiver 4001 and the processor 4003. Further, the transceiver 4001 may be coupled to one or more antennas.

A person of ordinary skill in the art may be aware that, in combination with the examples described in the embodiments disclosed in this specification, units and algorithm steps may be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed by hardware or software depends on particular applications and design constraint conditions of the technical solutions. A person skilled in the art may use different methods to implement the described functions for each particular application, but it should not be considered that the implementation goes beyond the scope of this application.

It may be clearly understood by a person skilled in the art that, for the purpose of convenient and brief description, for a detailed working process of the foregoing system, apparatus, and unit, refer to a corresponding process in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the described apparatus embodiments are merely examples. For example, the unit division is merely logical function division and may be other division in actual implementation. For example, a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not performed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections may be implemented by using some interfaces. The indirect couplings or communication connections between the apparatuses or units may be implemented in electronic, mechanical, or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of network units. Some or all of the units may be selected based on actual requirements to achieve the objectives of the solutions of the embodiments.

In addition, functional units in the embodiments of this application may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units are integrated into one unit.

When the functions are implemented in the form of a software functional unit and sold or used as an independent product, the functions may be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of this application essentially, or the part contributing to the prior art, or some of the technical solutions may be implemented in a form of a software product. The software product is stored in a storage medium, and includes several instructions for instructing a computer device (which may be a personal computer, a server, or a network device) to perform all or some of the steps of the method described in the embodiments of this application. The foregoing storage medium includes: any medium that can store program code, such as a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc.

The foregoing descriptions are merely specific implementations of this application, but are not intended to limit the protection scope of this application. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in this application shall fall within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims. 

What is claimed is:
 1. A method for establishing a guaranteed bit rate (GBR) quality of service (QoS) flow in a session, when dynamic policy and charging control (PCC) is not deployed, comprising: sending, by an access and mobility management function (AMF), first information, wherein the first information comprises establishment request information of a PDU session from a terminal device; receiving, by a session management function (SMF), the first information from the AMF; obtaining, by the SMF, PDU session management subscription information from a unified data management module (UDM); and establishing, by the SMF based on the first information and at least one of the PDU session management subscription information and local PDU session policy information of the SMF, a default GBR QoS flow in the PDU session.
 2. The method according to claim 1, wherein the first information comprises second information, and the second information is at least one of a subscription permanent identifier (SUPI), a data network name (DNN), single network slice selection assistance information (S-NASSI), service indication information, a default GBR QoS flow indication, QoS index information, and QoS parameter information.
 3. The method according to claim 2, wherein the obtaining, by the SMF based on the first information, PDU session management subscription information from a unified data management module UDM comprises: sending, by the SMF, a subscription information request message to the UDM, wherein the subscription information request message carries the second information; and receiving, by the SMF, the PDU session management subscription information sent by the UDM, wherein the PDU session management subscription information comprises subscription information of the default GBR QoS flow, and the subscription information of the default GBR QoS flow comprises a 5G quality of service identifier 5QI, an allocation and retention priority (ARP), a guaranteed flow bit rate (GFBR), and a maximum flow bit rate (MFBR).
 4. The method according to claim 1, wherein the method further comprising: rejecting, by the SMF, a request for establishing a non-GBR QoS flow in the PDU session.
 5. The method according to claim 1, wherein the default GBR QoS flow comprises a time-sensitive GBR QoS flow.
 6. A commuications system for establishing a guaranteed bit rate (GBR) quality of service (QoS) flow in a session, comprising: an access and mobility management function (AMF) and a session management function (SMF); the AMF is configured to send first information, wherein the first information comprises establishment request information of a PDU session from a terminal device; and the SMF is configured to: receivie the first information from the AMF; obtain PDU session management subscription information from a unified data management module UDM; and establish based on the first information and at least one of the PDU session management subscription information and local PDU session policy information of the SMF, a default GBR QoS flow in the PDU session, when dynamic policy and charging control (PCC) is not deployed.
 7. The system according to claim 6, wherein the first information comprises second information, and the second information is at least one of a subscription permanent identifier (SUPI), a data network name (DNN), single network slice selection assistance information (S-NASSI), service indication information, a default GBR QoS flow indication, QoS index information, and QoS parameter information.
 8. The system according to claim 7, wherein the SMF is configured to send a subscription information request message to the UDM, wherein the subscription information request message carries the second information; and receivie the PDU session management subscription information sent by the UDM, wherein the PDU session management subscription information comprises subscription information of the default GBR QoS flow, and the subscription information of the default GBR QoS flow comprises a 5G quality of service identifier 5QI, an allocation and retention priority (ARP), a guaranteed flow bit rate (GFBR), and a maximum flow bit rate (MFBR).
 9. The system according to claim 6, wherein the SMF is configured to further reject a request for establishing a non-GBR QoS flow in the PDU session.
 10. The method according to claim 6, wherein the default GBR QoS flow comprises a time-sensitive GBR QoS flow. 